README.md

.gitignore

node_modules

babel.config.js

module.exports = {
  presets: [
    '@babel/preset-env'  // Transforms modern JS (including ESM) to CommonJS
  ],
};

jest.config.js

module.exports = {
  transform: {
    // This tells Jest: "use babel-jest to transform any .mjs and .js files"
    '^.+\\.mjs$': 'babel-jest',
    '^.+\\.js$': 'babel-jest',
  },
  transformIgnorePatterns: [
    // By default, Jest ignores everything in node_modules
    // This pattern says: "ignore everything EXCEPT these ESM packages"
    '/node_modules/(?!(pg-boss|serialize-error)/).*/'
  ],
}

package.json

{
  "name": "jest-test",
  "version": "0.0.0",
  "description": "",
  "license": "MIT",
  "author": "Bret Comnes <bcomnes@gmail.com> (https://bret.io/)",
  "type": "commonjs",
  "main": "index.js",
  "scripts": {
    "test": "jest"
  },
  "devDependencies": {
    "@babel/core": "^7.28.5",
    "@babel/preset-env": "^7.28.5",
    "babel-jest": "^30.2.0",
    "jest": "^30.2.0"
  },
  "dependencies": {
    "pg-boss": "12.3.0"
  }
}

sum.js

function sum(a, b) {
  return a + b;
}
module.exports = sum;

sum.test.js

const sum = require('./sum');
const { PgBoss } = require('pg-boss')

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
  readme()
    .catch(err => {
      console.log(err)
      process.exit(1)
    })
});

async function readme() {

  const boss = new PgBoss('postgres://localhost/pgboss');

  boss.on('error', console.error)

  await boss.start()

  const queue = 'readme-queue'

  await boss.createQueue(queue)

  const id = await boss.send(queue, { arg1: 'read me' })

  console.log(`created job ${id} in queue ${queue}`)

  await boss.work(queue, async ([ job ]) => {
    console.log(`received job ${job.id} with data ${JSON.stringify(job.data)}`)
  })
}

readme()
  .catch(err => {
    console.log(err)
    process.exit(1)
  })